Unexpected Temperature-Dependent Single Chain Mechanics of Poly(N-isopropyl-acrylamide) in Water
Poly(N-isopropyl-acrylamide) (PNIPAM) is a paradigm thermally sensitive polymer, which has a lower critical solution temperature (LCST) of ∼32 °C in water. Herein by AFM-based single molecule force spectroscopy (SMFS), we measured the single chain elasticity of PNIPAM across the LCST in water. Belo...
Gespeichert in:
| Veröffentlicht in: | Langmuir 2012-03, Vol.28 (11), p.5151-5157 |
|---|---|
| Hauptverfasser: | , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 5157 |
|---|---|
| container_issue | 11 |
| container_start_page | 5151 |
| container_title | Langmuir |
| container_volume | 28 |
| creator | Cui, Shuxun Pang, Xiangchao Zhang, Shen Yu, You Ma, Hongwei Zhang, Xi |
| description | Poly(N-isopropyl-acrylamide) (PNIPAM) is a paradigm thermally sensitive polymer, which has a lower critical solution temperature (LCST) of ∼32 °C in water. Herein by AFM-based single molecule force spectroscopy (SMFS), we measured the single chain elasticity of PNIPAM across the LCST in water. Below LCST, the force curves obtained at different temperatures have no remarkable difference; while above LCST, an unexpected temperature dependent elasticity is observed, mainly in the middle force regime. We found that 35 °C is a turning point of the variation: from 31 to 35 °C, the middle parts of the force curves drop gradually, whereas from 35 to 40 °C, the middle parts rise gradually. A possible mechanism for the unexpected temperature dependent mechanics is proposed. The single chain contraction against external force upon heating from 35 to 40 °C may cast new light on the design of molecular devices that convert thermal energy to mechanical work. |
| doi_str_mv | 10.1021/la300135w |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_929507546</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>929507546</sourcerecordid><originalsourceid>FETCH-LOGICAL-a344t-e816bf1a7880c53423a76371a955ae65e5fcc1d90057af787cc43fff9fbd54cf3</originalsourceid><addsrcrecordid>eNpt0D1PwzAQgGELgaAUBv4AyoKAIWDHcRyPqHxKfElQMYarc4Ygxwl2Iui_J4hCF6ZbHt2dXkJ2GD1iNGHHFjiljIuPFTJiIqGxyBO5SkZUpjyWacY3yGYIb5RSxVO1TjaShIskU_mIPE8dfraoOyyjR6xb9ND1HuNTbNGV6LrooXIvFqPJK1QuukH9Cq7SIWpMdN_Y-cFtXIWm9U07tzFoP7dQVyUeRgN-gg79FlkzYANuL-aYTM_PHieX8fXdxdXk5DoGnqZdjDnLZoaBzHOqBU8TDjLjkoESAjATKIzWrFSUCglG5lLrlBtjlJmVItWGj8n-z97hl_ceQ1fUVdBoLThs-lCoRAkqxRBjTA5_pPZNCB5N0fqqBj8vGC2-exZ_PQe7u9jaz2os_-RvwAHsLQAEDdZ4cLoKSycyMdxUSwc6FG9N790Q45-DXwBfiaA</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>929507546</pqid></control><display><type>article</type><title>Unexpected Temperature-Dependent Single Chain Mechanics of Poly(N-isopropyl-acrylamide) in Water</title><source>ACS Publications</source><creator>Cui, Shuxun ; Pang, Xiangchao ; Zhang, Shen ; Yu, You ; Ma, Hongwei ; Zhang, Xi</creator><creatorcontrib>Cui, Shuxun ; Pang, Xiangchao ; Zhang, Shen ; Yu, You ; Ma, Hongwei ; Zhang, Xi</creatorcontrib><description>Poly(N-isopropyl-acrylamide) (PNIPAM) is a paradigm thermally sensitive polymer, which has a lower critical solution temperature (LCST) of ∼32 °C in water. Herein by AFM-based single molecule force spectroscopy (SMFS), we measured the single chain elasticity of PNIPAM across the LCST in water. Below LCST, the force curves obtained at different temperatures have no remarkable difference; while above LCST, an unexpected temperature dependent elasticity is observed, mainly in the middle force regime. We found that 35 °C is a turning point of the variation: from 31 to 35 °C, the middle parts of the force curves drop gradually, whereas from 35 to 40 °C, the middle parts rise gradually. A possible mechanism for the unexpected temperature dependent mechanics is proposed. The single chain contraction against external force upon heating from 35 to 40 °C may cast new light on the design of molecular devices that convert thermal energy to mechanical work.</description><identifier>ISSN: 0743-7463</identifier><identifier>EISSN: 1520-5827</identifier><identifier>DOI: 10.1021/la300135w</identifier><identifier>PMID: 22352698</identifier><identifier>CODEN: LANGD5</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Chemistry ; Exact sciences and technology ; General and physical chemistry</subject><ispartof>Langmuir, 2012-03, Vol.28 (11), p.5151-5157</ispartof><rights>Copyright © 2012 American Chemical Society</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a344t-e816bf1a7880c53423a76371a955ae65e5fcc1d90057af787cc43fff9fbd54cf3</citedby><cites>FETCH-LOGICAL-a344t-e816bf1a7880c53423a76371a955ae65e5fcc1d90057af787cc43fff9fbd54cf3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/la300135w$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/la300135w$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,2765,27076,27924,27925,56738,56788</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25655469$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/22352698$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Cui, Shuxun</creatorcontrib><creatorcontrib>Pang, Xiangchao</creatorcontrib><creatorcontrib>Zhang, Shen</creatorcontrib><creatorcontrib>Yu, You</creatorcontrib><creatorcontrib>Ma, Hongwei</creatorcontrib><creatorcontrib>Zhang, Xi</creatorcontrib><title>Unexpected Temperature-Dependent Single Chain Mechanics of Poly(N-isopropyl-acrylamide) in Water</title><title>Langmuir</title><addtitle>Langmuir</addtitle><description>Poly(N-isopropyl-acrylamide) (PNIPAM) is a paradigm thermally sensitive polymer, which has a lower critical solution temperature (LCST) of ∼32 °C in water. Herein by AFM-based single molecule force spectroscopy (SMFS), we measured the single chain elasticity of PNIPAM across the LCST in water. Below LCST, the force curves obtained at different temperatures have no remarkable difference; while above LCST, an unexpected temperature dependent elasticity is observed, mainly in the middle force regime. We found that 35 °C is a turning point of the variation: from 31 to 35 °C, the middle parts of the force curves drop gradually, whereas from 35 to 40 °C, the middle parts rise gradually. A possible mechanism for the unexpected temperature dependent mechanics is proposed. The single chain contraction against external force upon heating from 35 to 40 °C may cast new light on the design of molecular devices that convert thermal energy to mechanical work.</description><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><issn>0743-7463</issn><issn>1520-5827</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNpt0D1PwzAQgGELgaAUBv4AyoKAIWDHcRyPqHxKfElQMYarc4Ygxwl2Iui_J4hCF6ZbHt2dXkJ2GD1iNGHHFjiljIuPFTJiIqGxyBO5SkZUpjyWacY3yGYIb5RSxVO1TjaShIskU_mIPE8dfraoOyyjR6xb9ND1HuNTbNGV6LrooXIvFqPJK1QuukH9Cq7SIWpMdN_Y-cFtXIWm9U07tzFoP7dQVyUeRgN-gg79FlkzYANuL-aYTM_PHieX8fXdxdXk5DoGnqZdjDnLZoaBzHOqBU8TDjLjkoESAjATKIzWrFSUCglG5lLrlBtjlJmVItWGj8n-z97hl_ceQ1fUVdBoLThs-lCoRAkqxRBjTA5_pPZNCB5N0fqqBj8vGC2-exZ_PQe7u9jaz2os_-RvwAHsLQAEDdZ4cLoKSycyMdxUSwc6FG9N790Q45-DXwBfiaA</recordid><startdate>20120320</startdate><enddate>20120320</enddate><creator>Cui, Shuxun</creator><creator>Pang, Xiangchao</creator><creator>Zhang, Shen</creator><creator>Yu, You</creator><creator>Ma, Hongwei</creator><creator>Zhang, Xi</creator><general>American Chemical Society</general><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20120320</creationdate><title>Unexpected Temperature-Dependent Single Chain Mechanics of Poly(N-isopropyl-acrylamide) in Water</title><author>Cui, Shuxun ; Pang, Xiangchao ; Zhang, Shen ; Yu, You ; Ma, Hongwei ; Zhang, Xi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a344t-e816bf1a7880c53423a76371a955ae65e5fcc1d90057af787cc43fff9fbd54cf3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Chemistry</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Cui, Shuxun</creatorcontrib><creatorcontrib>Pang, Xiangchao</creatorcontrib><creatorcontrib>Zhang, Shen</creatorcontrib><creatorcontrib>Yu, You</creatorcontrib><creatorcontrib>Ma, Hongwei</creatorcontrib><creatorcontrib>Zhang, Xi</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cui, Shuxun</au><au>Pang, Xiangchao</au><au>Zhang, Shen</au><au>Yu, You</au><au>Ma, Hongwei</au><au>Zhang, Xi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unexpected Temperature-Dependent Single Chain Mechanics of Poly(N-isopropyl-acrylamide) in Water</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2012-03-20</date><risdate>2012</risdate><volume>28</volume><issue>11</issue><spage>5151</spage><epage>5157</epage><pages>5151-5157</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>Poly(N-isopropyl-acrylamide) (PNIPAM) is a paradigm thermally sensitive polymer, which has a lower critical solution temperature (LCST) of ∼32 °C in water. Herein by AFM-based single molecule force spectroscopy (SMFS), we measured the single chain elasticity of PNIPAM across the LCST in water. Below LCST, the force curves obtained at different temperatures have no remarkable difference; while above LCST, an unexpected temperature dependent elasticity is observed, mainly in the middle force regime. We found that 35 °C is a turning point of the variation: from 31 to 35 °C, the middle parts of the force curves drop gradually, whereas from 35 to 40 °C, the middle parts rise gradually. A possible mechanism for the unexpected temperature dependent mechanics is proposed. The single chain contraction against external force upon heating from 35 to 40 °C may cast new light on the design of molecular devices that convert thermal energy to mechanical work.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>22352698</pmid><doi>10.1021/la300135w</doi><tpages>7</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0743-7463 |
| ispartof | Langmuir, 2012-03, Vol.28 (11), p.5151-5157 |
| issn | 0743-7463 1520-5827 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_929507546 |
| source | ACS Publications |
| subjects | Chemistry Exact sciences and technology General and physical chemistry |
| title | Unexpected Temperature-Dependent Single Chain Mechanics of Poly(N-isopropyl-acrylamide) in Water |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-07T02%3A33%3A08IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Unexpected%20Temperature-Dependent%20Single%20Chain%20Mechanics%20of%20Poly(N-isopropyl-acrylamide)%20in%20Water&rft.jtitle=Langmuir&rft.au=Cui,%20Shuxun&rft.date=2012-03-20&rft.volume=28&rft.issue=11&rft.spage=5151&rft.epage=5157&rft.pages=5151-5157&rft.issn=0743-7463&rft.eissn=1520-5827&rft.coden=LANGD5&rft_id=info:doi/10.1021/la300135w&rft_dat=%3Cproquest_cross%3E929507546%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=929507546&rft_id=info:pmid/22352698&rfr_iscdi=true |